Nonprofit Program Expenses vs Administration Expenses

I have some confusion about what is considered Administrative expenses vs Program. For example: Are all office supplies considered Administrative or do they fall under Program if used solely by the Program departments? There seems to be a lot of overlap and grey areas. My FD says to put as much as I can into Programs, so I am as it’s her call, but I was wondering what other people do. My instinct is to put as much as I can into Administrative. Is this a “see how much Programs cost.” to donors thing so they will give us more money?